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-                      v18
+                      v19
 }}}
   '''Question: Implement your load-balancer.rb, run it on ''switch'', and display the number of bytes and queue length on both left and right node when a decision is made'''[[BR]]
+  '''Question: Implement your load-balancer.rb, run it on ''switch'', and display the number of bytes and queue length on both left and right node when a new TCP flow comes and path decision is made'''[[BR]]
   '''A sample output should be as follows: [[BR]]'''
 {{{
 …
 so this new flow goes left. Total number of flows on left: 1
 }}}
+  You can use iperf to generate TCP flows from ''outside'' node to ''inside'' node:
+ -
+  - On ''inside'', run:
+{{{
+/usr/local/etc/emulab/emulab-iperf -s
+}}}
+  - On ''outside'' run the following multiple times, with about 6 seconds interval between each run:
+{{{
+/usr/local/etc/emulab/emulab-iperf -c 10.10.10.2 -t 100 &
+}}}
+    This will give the ''netinfo.py'' enough time to collect network usage statistics from both left and right node so that the load-balancer can make the right decision.
   '''If you really do not know where to start, you can find a semi-complete load-balancer.rb [http://www.gpolab.bbn.com/experiment-support/OpenFlowExampleExperiment/load-balancer-hint.rb HERE], you only need to complete the ''next_path'' function that prints out the statistics of each path and returns the path choice''' [[BR]]